The sensitivity of our TMC-1 data is better than
previously published line surveys of this source at the same frequencies [1]} by a factor 10-20.
In fact, it has been possible to detect many individual lines from molecules
that were reported previously only by stacking techniques [2]}.
The recent discovery of some molecules
containing the ethynyl group (CCH), such as vinyl and allenyl acetylene [3]}, [4]},
and of the propargyl radical [5]},
prompted us to search for other chemically related hydrocarbons.
Line identification in this work was done using the catalogues
MADEX [6]}, CDMS [7]}, and JPL [8]}.
